Evidence of a 3 billion year old impact crater - the result of a massive asteroid or comet collision - was found near the Maniitsoq region of West Greenland. The crater was discovered by a team of scientists from Cardiff, the Geological Survey of Denmark and Greenland (GEUS) in Copenhagen, Lund University in Sweden and the Institute of Planetary Science in Moscow. The scientists say the impact happened so long ago that no obvious crater could be seen. However, several layers below the surface, the shock of the collision melted and collapsed minerals exposed to the extreme heat.

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Nina Sen

Nina Sen is a frequent contributor to Live Science’s Life’s Little Mysteries series: an exploration and explanation of our world’s phenomena, both natural and man-made. She also writes astronomy photo stories for Live Science's sister site Space.com.